Tính ngày dự sinh (kỳ kinh cuối, thụ thai, IVF)
Tính ngày dự sinh theo kỳ kinh cuối, ngày thụ thai hoặc ngày chuyển phôi IVF (phôi ngày 3 hoặc ngày 5). Xem tuổi thai hôm nay, tam cá nguyệt và khoảng thời gian chuyển dạ thực tế (37–42 tuần).
Which method is most accurate for calculating due dates?
Early ultrasound dating is often the most accurate. LMP and conception estimates can be off when ovulation timing varies.
Why does the calculator use 280 days for LMP?
It assumes a 28-day cycle with ovulation around day 14. Real cycles vary, so the estimate can shift.
How is IVF due date different?
IVF uses the transfer date and embryo day to anchor timing. It then converts it to an LMP-equivalent for consistent weeks.
What is the labor window?
A realistic range when many births happen. Often shown as 37 to 42 weeks.
Why is gestational age about 2 weeks ahead of conception?
Pregnancy dating traditionally starts from LMP, which is usually about 2 weeks before ovulation and conception.
How do trimesters break down?
Common split is 1st to week 13, 2nd weeks 14–27, 3rd week 28 onward.
Should I trust this calculator over my doctor’s due date?
No. Use this as a reference. Follow your clinician’s dating, especially if ultrasound has adjusted it.